Spain's 17 regional governments are a big part of the country's financial problems.

Like the regional savings banks, they are victims of the country's property boom and bust.

During the boom years, regional government tax revenues were swelled by stamp duties on property sales, and by income taxes paid by immigrants that came to work on the country's construction sites.

The boom was felt most strongly on the Mediterranean coast, where hotels were built for tourists and villas for pensioners and the wealthy.

The regional governments also found themselves spending more - on big infrastructure projects, on education for the immigrants' children, as well as on providing increasingly expensive healthcare, especially for the growing elderly population.

Then the bust came.

Tax revenues - not just stamp duties, but also income taxes and the VAT earned from consumer spending - have collapsed during the recession.

Valencia

In July, Valencia became the first region to ask for money from the central government's rescue fund.

One of the most financially troubled regions, Valencia's name has become particularly associated with white elephant construction projects - a problem across the country.

The Castellon airport, opened in March 2011, has yet to receive a single commercial flight.

And critics see the sprawling City of Arts and Sciences - a gleaming complex which was inaugurated in 1998 and added to over 15 years - as a symbol of excess, which they say went three times over budget.

Murcia

Population: 1.5 million

Deficit: 4.3% of GDP

Debt: 2.8bn euros

Despite being one of Spain's smallest regions, news that Murcia would join Valencia in requesting a bailout sent the Spanish government's own borrowing cost on financial markets to a record high in July.

Like the other Mediterranean coastal regions Murcia has been at the sharp end of Spain's construction boom and bust.

Its failure to manage its finances was seen as a worrying portent for its much bigger neighbours.

Catalonia

Population: 7.5 million

Deficit: 3.7% of GDP

Debt: 41.8bn euros

Catalonia has become the most pivotal region in the current crisis.

Image caption
Cuts to healthcare spending by the Catalan government sparked protests last year

It has the biggest economy in Spain, but it also has the biggest debts.

Because of their relative wealth, Catalans pay a lot more in taxes to Madrid than they receive via central government spending in return.

In effect, some 10% of Catalonia's GDP each year is used to provide financial support to the rest of Spain.

On top of that burden, the Catalan government has had to borrow heavily to support its own economy, which has been particularly hit hard by the economic downturn.

Catalans consider themselves a separate nation within Spain with their own language, so the government in Barcelona has been reluctant to ask Madrid for a bailout.

In the past two years the government instead turned to the patriotism of its own citizens, selling them bonds to finance its budget shortfall.

However, this summer Catalonia finally had to ask for 5bn euros from Madrid's rescue fund.

The irony that the biggest tax contributor to Madrid's coffers has had to beg for a bailout is a source of great bitterness for Catalans.

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Media captionSome 1.5 million Catalans took to the streets of Barcelona to march for independence

It has strengthened demands for greater financial autonomy, similar to what the Basques enjoy, and the Barcelona government has called early elections for November, construing it as a plebiscite on the issue.

But many Catalans want to go the whole hog, with 1.5 million turning out for a rally demanding full independence in September.

The Catalonian president, Artur Mas, has himself called for a referendum, something that would breach Spain's constitution.

However, if Catalonia did go its own way, it would leave an enormous hole in Madrid's finances.

Andalucia

Population: 8.4 million

Deficit: 3.2% of GDP

Debt: 14.3bn euros

The enormous southern region of Andalucia is the most populous in Spain.

Image caption
Like many regions, tourist-friendly Andalucia has felt the effects of the property market collapse

It is also one of the poorest - which is ironically something of a blessing in disguise.

It has made Andalucia the biggest recipient of net spending by the central government - something that has helped to prop up the region's economy, and that has ultimately been paid for by the much wealthier citizens of Catalonia and elsewhere in Spain.

It has helped the regional government keep its own spending under control, and Andalucia has relatively little debt given its size.

A lot of central government spending goes on Andalucian unemployment benefits.

The unemployment rate in the region has always been among the highest in Spain - a country which as a whole suffers from chronically high joblessness.

In the current recession, it has risen to 33% as of March 2012. Youth unemployment was 58%.

But Andalucia's dependence on Madrid's largesse also means that it is particularly exposed to spending cuts by the central government.

In late September, the region confirmed that it would become the fourth region to turn to Madrid's bailout fund.

Castile-La Mancha

Population: 2.1 million

Deficit: 7.3% of GDP

Debt: 6.6bn euros

Crisis jargon buster

Use the dropdown for easy-to-understand explanations of key financial terms:

AAA-rating

AAA-rating

The best credit rating that can be given to a borrower's debts, indicating that the risk of borrowing defaulting is minuscule.